An experimental study concerning the performance of a rectangular fin in both dry and wet condition was carried out. The visual observation of the dehumidifying phenomenon identified four regions, including the fully dry, very fine droplet, larger droplet, and film-like region. Experimental results showed that the effect of dry bulb temperature on the wet fin efficiency is very small. The dry fin efficiency is about 15–25 percent higher than that of the corresponding wet fin efficiency. For fully wet condition, the effect of relative humidity on the fully wet fin efficiency is also small. For partially wet surface, a considerable influence of the relative humidity on the fin efficiency is encountered. Test results for the fully wet fin efficiency agree well with some of the previous studies but disagree with some of the previous investigations. The main cause to this controversy may be attributed to the formulation of the relation between the humidity ratio and the fin temperature. The fully wet fin efficiency decrease slightly with increase of fin base temperature. However, the effect of fin base temperature on the dry fin efficiency is relatively small.
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Technical Papers
Performance of Rectangular Fin in Wet Conditions: Visualization and Wet Fin Efficiency
Yur-Tsai Lin,
Yur-Tsai Lin
Department of Mechanical Engineering, Yuan-Ze University, Taoyuan, Taiwan
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Kuei-Chang Hsu,
Kuei-Chang Hsu
Department of Mechanical Engineering, Yuan-Ze University, Taoyuan, Taiwan
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Yu-Juei Chang,
Yu-Juei Chang
Energy & Resources Laboratories, Industrial Technology Research Institute, Hsinchu, 310, Taiwan
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Chi-Chuan Wang, Mem. ASME
e-mail: ccwang@itri.org.tw
Chi-Chuan Wang, Mem. ASME
Energy & Resources Laboratories, Industrial Technology Research Institute, Hsinchu, 310, Taiwan
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Yur-Tsai Lin
Department of Mechanical Engineering, Yuan-Ze University, Taoyuan, Taiwan
Kuei-Chang Hsu
Department of Mechanical Engineering, Yuan-Ze University, Taoyuan, Taiwan
Yu-Juei Chang
Energy & Resources Laboratories, Industrial Technology Research Institute, Hsinchu, 310, Taiwan
Chi-Chuan Wang, Mem. ASME
Energy & Resources Laboratories, Industrial Technology Research Institute, Hsinchu, 310, Taiwan
e-mail: ccwang@itri.org.tw
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division June 26, 2000; revision received April 2, 2001. Associate Editor: B. Chung.
J. Heat Transfer. Oct 2001, 123(5): 827-836 (10 pages)
Published Online: April 2, 2001
Article history
Received:
June 26, 2000
Revised:
April 2, 2001
Citation
Lin , Y., Hsu, K., Chang , Y., and Wang, C. (April 2, 2001). "Performance of Rectangular Fin in Wet Conditions: Visualization and Wet Fin Efficiency ." ASME. J. Heat Transfer. October 2001; 123(5): 827–836. https://doi.org/10.1115/1.1391275
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